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Peak Ranch Resource <br /> August 5, 2020 <br /> EXHIBIT D — MINING PLAN <br /> 1.0 INTRODUCTION <br /> The following is the mining plan for the proposed Peak Ranch Resource to be operated by permittee Kilgore <br /> Companies, LLC dba Peak Materials ("Peak Materials"). Peak Materials proposes to mine the Peak Ranch <br /> Resource gravel deposit and load the material into trucks for transportation to its currently permitted and <br /> operating Maryland Creek Ranch facility(M-1996-049).At the Maryland Creek Ranch facility, the gravel will <br /> be processed into construction products including sand, gravel, aggregate, fill, asphalt, concrete, and road <br /> base. No materials processing will occur at the Peak Ranch Resource facility. <br /> 1.1. Pre-Mining and Topsoil Stripping <br /> The site of the proposed Peak Ranch Resource is currently overgrazed rangeland with a few farm structures <br /> (see Exhibit C, Sheet C-1). The rangeland has historically been irrigated with decreed water rights associated <br /> with the"Hawk Hill Pump and Pipeline"water right. This right operates pursuant to a Water Court approved <br /> plan for augmentation water which provides for releases from Green Mountain Reservoir in Heeney, Colorado <br /> to replace out-of-priority depletions (decreed in Case No. 89CW167). <br /> Prior to beginning activities on the site, the boundaries of the affected area will be clearly marked. Signs and <br /> markers will be posted at the mine entrance listing the name of the Operator, Peak Materials, and the <br /> operation name, "Peak Ranch Resource"; a statement that a reclamation permit for the operation has been <br /> issued by the Colorado Mined Land Reclamation Board; and the DRMS permit number.A 30-foot-wide gravel <br /> road will be constructed within the Permit Boundary (see Exhibit C, Sheet C-2A). Peak Materials will work with <br /> the Colorado Department of Transportation (CDOT)to complete road improvements to Colorado Highway 9 <br /> necessary to accommodate the transport of materials from Peak Ranch Resource to Maryland Creek Ranch. <br /> As shown on Exhibit C, Sheet C-2A, topsoil and overburden' will be stripped at Peak Ranch and used to <br /> construct 8 to 10-foot-tall privacy berms on the north,west and south sides of the site. These berms will be <br /> installed at the start of operations on the site. They will be vegetated promptly. Trees will be planted at key <br /> locations near the berms. Exhibit C, Sheets C-2A and C-2B show the approximate tree locations. The berm <br /> along the south side of the site that wraps around to the east edge will be permanent, meaning it will remain <br /> on the site following reclamation. This permanent berm will be constructed of overburden covered with topsoil. <br /> The berms to be built on the north (north refers to the berm on the north side that also wraps on the west and <br /> east edges) and west(located along the west side of the property in the south half of the site) edges will be <br /> constructed of only topsoil. <br /> As described in Section 1.2 Mining Phases, Phase 1 is divided into Phase 1 North and Phase 1 South. <br /> Topsoil that is stripped from Phase 1 North, along with 60%to 70%of the overburden from this area,will be <br /> used for the construction of the privacy berms.Any topsoil or overburden not used in privacy berm <br /> construction will be immediately placed as part of contemporaneous reclamation or stockpiled on-site in a <br /> topsoil and overburden storage area for later use during reclamation. Temporary stockpiles of overburden or <br /> topsoil required for reclamation may be up to 20 feet in height. Temporary stockpiles will be in the designated <br /> area shown on Maps C-2A and C-2B. Because excavation will proceed to final mine slopes and grades <br /> (illustrated on Exhibit C, Sheet C-3), it is anticipated that minimal backfilling with overburden will occur during <br /> reclamation. Overburden present on site will be stripped during mining and either placed directly on mined out <br /> ground as part of reclamation, stored in the stockpile area, or used to build the core of the south/southeast <br /> berm (Exhibit C, Sheets C-2A and C-2B). Mining to final slopes and the direct placement of overburden onto <br /> reclamation slopes will reduce the need to stockpile overburden material and shorten the time that it will take <br /> to reclaim the mine. Once mining is completed,the overburden will be replaced, and these areas will be ready <br /> to receive topsoil. Details on topsoil and overburden quantities can be found in Table D-2: Topsoil and <br /> Overburden Material Balances During Mining and Table E-2: Topsoil and Overburden Material Balances <br /> During Reclamation. <br /> For this project,overburden is defined as the thin layer of subsoil just below the topsoil and above the deposit. <br /> <;n-%I.ewecki and Aszociatcx,P1.1,l' D-1 <br /> O TETRA TECH <br />